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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be8f18600e2a13733707361368a9231400a421bbac5180dd03a498b32969c2a8' 
  AND token = 'IrsQFledKmk6o39joo+EPVdyahuYL7VWw/P0hPpcw1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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