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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '936a112aa40ff641b7bcf138d91ec78f209a8a9bed7f7bdd5b40fae25bba3df3' 
  AND token = 'Dp6xn8KCCIfbsO58ACtys8CIMvnqLZBmi4t2oP/CemY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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