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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a61ee68a58c2808ec5ffbd04c0e3ea84a5b07b1d4076c49687697a940125ab67' 
  AND token = 'NOFeg26oAWTTqJ7uqGIbHGUeG3YLgYy+x/7p+EktEr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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