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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff58bc43a3c3e80f0fb66e7020294000b31084927c1a42fdeed60e4083b200fb' 
  AND token = 'U/TpRWXc6JQye+XJuoTMJGKGse/8NVdc1AI/IoDP9K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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