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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '351e3b4fccb90c7b72ecc24d65e4e8666fd0e99bfbdeb18f1d1709e9d0968b82' 
  AND token = 'xXyQkcrwpwVeI5t5WaWGt7r5ffS8NbqiIiiIbPq16pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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