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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e28b1b16ef9acb8f73c0adccf010c4549ef6cfe9d2aefc7166af2f71f207452e' 
  AND token = '5vHKSnY9lKJQ+ZBc9ecaPCXZximPW590dFTbZTtoxh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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