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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eed4a7dacd96a3aeb500d50f825068f9af3e4323b66d603ebefde99af6542fba' 
  AND token = 'WX4U0N4c0e0L8nFcB1U3kPYoJBLvzIwrvwCcy1LC3RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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