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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79aa551bd8564337b039df79a6d2206b163ca9b7d17ceef3f9d9e401d998ff25' 
  AND token = 'IgAcBzO3m1bmwaKUjyoS4EfoNm1zxLkO9uosalZnl8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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