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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d223ea9d0e7f83d424b40ec723832c4a0b58ab5b2546c73034fcdd3dd4866db' 
  AND token = 'i/G6oFFuhdDALAWs0a6bMx2WS/Ep48jnBYWj7EU3RxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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