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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b987970e4dca50e2d89382ac2c65d69e9f6b0e5cdbbadea5aa6d6dcc55684b4b' 
  AND token = 'Sjfc1/g9mJVo4aYzQTnUbzDWEnF7W770em1KQXDxEbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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