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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da533f490a4564abc0d3d2a4328e7d2ec1824e14f3c74c2ad27422777a657a53' 
  AND token = 'FIJ59epS4dLmtfGJ2PgLAJkZDKKNV8sF5z6siRGWY/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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