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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f59ede2be4f9823d252c643c4d0680694e825c07a3d38f186d7bb3a3ff4a2098' 
  AND token = 'AMqbw/amxPY55ScTZzelH3FAZPwd/xi9UYlwVEpDi3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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