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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91dd9732a1ac7fa9c1d907605705a4a4014ee50af8a3c4e6e3f746f6991536d5' 
  AND token = 'PZiJSmEn7Fzu14MZuOk2LdXsA5xCVcjq/WFskuD1PDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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