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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abcccd73625334cc3c890b1329836562d66a8730ccd9bfe053b516289090e7ff' 
  AND token = 'RXfO1y6F5ecVBn2bQ4H6c6K5NsZfwQdS4w2/NixXhDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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