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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c36d1f24a5c336296944a2ecd1cba0ac85ad19e849b29b66175487fa8bfe2329' 
  AND token = '0Jj/kqbCXCFzWnGJ0D7D1VJKl3e0fIOHG9NV33f236o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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