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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99a6c8a97f9c7a94df43ffbb136027cfff584f5312ec47d475d21189afc76040' 
  AND token = 'PwDBc86q5DUkq1Ay5P5vEkBdAvlUgN4danPLvGJbd50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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