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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '760de2b58ec844643d6cc189aef83cce861e9863ae916a5c648a67047bc45549' 
  AND token = 'W4XS941fHrQ4atm3WUOEew3mBsD4v2Ai0eZP6A7/2MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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