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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6f36467f216690ba31aa7d56b2217540774e497e7585acaf8b485d02290443b' 
  AND token = 'bgkcx5iR0DY7km6NJKFicdf+p5rPL0u/UPC5g28w/Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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