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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57cb67f089cbad1f7e9d18adace32c6f192c5362ad8d5e72e2c723d5d171bc3a' 
  AND token = 'wlh6M4HAUEc54z3rl/PvtyRUkFSinntyI01SkHaNspU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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