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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84e43d99ed57c0f11a0a8bbf3fe230984d16ec384ce46ca3ece78f7a4c8471ce' 
  AND token = 'kMkUySg2vRxnKwH2friiNn9AJf+4KoZUb1RdxfkAIxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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