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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9dd89a0ba7da24fe4ef1867eed29b62806da7d3aa49a444c253ef4e8ab6c379' 
  AND token = '9udS4myFUs1oUBYWWHMCyKjit/DFRDLaWNxouPzYt4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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