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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7d3a8d81ebcd86921b63378fa58119fbbfac623cad56ab08a44abe4f34aa54f' 
  AND token = 'jj1Gcyr3sUn5mSvPPh5a+LNLQtZbPfc01hMUExPJ3RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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