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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd729648bbc6278a36d8b9cf27875ae9f74d8d1ddfa8f6fe4ccbc63ac0bf50ad9' 
  AND token = 'ZSIs6YqmauSjLg2dO7esZu5q1t+9l3ANGAXRumFeTRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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