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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe5ff5d1acc852e12c5c1a59dd7574902cce2392a7f97a8837802bb3447d927e' 
  AND token = '94QsZGd949zOWP+MjB94z9mMOyA5wV53G2PX8+Yw0uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}