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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8d5038ebd34c0e74a460c03e9cd266bf07461da4028b452157ab90b0bc132f7' 
  AND token = 'EcFmWY6GgTNQNEbeLSQHGIjIW6ZruLlhYK7oThcie3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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