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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c888b905a43639d1ef97f7df982b004eea70043b733047a7acfdc7106fa8033' 
  AND token = 'UjwHc1r6DpwzCglLP70JXOif27p7O7PimvcEt3QM4s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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