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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d87e47f603556af8ea0cec9907804a92a09af765040318babed0b9ae576ce29' 
  AND token = '5SlUM15ts0q7bKUcJdjnM21SY6spt+9NEZPVm1FXPqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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