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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e065053685a097d0b2b6345a6d58f5a5fd0cad06b5abb600bd619fcf2cd5d3b' 
  AND token = 'hPCU28puW5hI2QrWF8BXKE6fcztMRbW6KawppAnyhKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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