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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6146793df8494be4d0d2871fa619e34c45cfad62989a9b753d6ddb94a332557' 
  AND token = 'N6McWlYVJLXY1eS9FhuXD4oILlasGKpSQu2Ux5X4FYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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