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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '276205d438c39e7d798c9d17b1ce30a6218eb040ca6156d2c1861508376d97d3' 
  AND token = 'DJU7yzal/2PRHBhsHXF2B1eHrNaK/krckcgSAtXmKNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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