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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8ff856333d8ec240b89aab15be2c31736b5a7042055e0e3284160c179778c4b' 
  AND token = 'aoUGTdw0Wt7A40iBFrL00ecWViEcbWlm7sYOrXEkAFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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