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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e6ac408ac79b78ea625616fca13f71ec2ba93baa211d872c8157f9c1862ab4c' 
  AND token = 'e3fVzJHzHdWFZW13y5O6Uaij/Rp+/kFrV4kTV6wOWpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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