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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a9593c87bb80db448d2a33fe83a33ebe561f8c39007e3d1096283ea11c34976' 
  AND token = 'YnkbNZJv93AmutTOeyS1S+4aKa+kD1A9+1D/7ik9NGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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