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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2988c213b9bb758fa57a662bcd1d16f64b7b96351e0110e70ba4e3e2dc750db3' 
  AND token = 'aAjzXXOdZecCMKKtIPom0Mazw3OxmRYMjPT7Jz7UmOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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