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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '790baef94455294d10f6c005b292961231992697e2a96e29226a4e24d79daa7e' 
  AND token = 'CU/5mUOJ3CvNUxrep0iRno2V06OFX84/BXQCZd3QuFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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