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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31fa66e23e798f964d9774acebdc9dd174bb10117459638690a0542f8a1bd9a5' 
  AND token = 'k2AdKD3pUkyYnyW2SfMdE39MVJSq6lrrt3xrvKUq6GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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