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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '123fa3b2dcb88d0cc0685f96f1bc32d6b8a5b67daf210b7f32cf15db04b7a1d2' 
  AND token = 'Lc7o2Sorn6F+9mHgb9OUs9NB8DAhxtKkmn9UU8QVhho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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