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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c91618db1e96cffa7c7fe7ac45eb1891a40e00f7c281547c9b4681641de20c73' 
  AND token = 'kw77qvl+pCNDhApzOFz4lzA63ashR3qtts2mmniRhpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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