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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b61c956a4b6338f4000c3d411084efe0cdcc3907001fc1c58369cca5ba7454c' 
  AND token = 'tS6XE9GYEHLhj+XNLp2MhcwdVr+sfPMjwuS5wwCifb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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