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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d4e7f5314f24cc63d1d4f2a90fa2a900f96232cf0f62596731fc6f60e088a16' 
  AND token = 'x8D+OwIGKLIAyS5SEdj2T/MZpAkSS2/Dl75mnONs7KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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