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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17f44eccf7d3664d1b484e9edc0536b0c82ac79b733648301a8eb319be71f064' 
  AND token = 'Qh3jabXR9Muu1+i7L8eOJPOAylJvF/3UoCef8Kfwfb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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