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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27c351869a3b7af5f4da0698a0c3febe280cd71757da4c6b9799e38af9e210cc' 
  AND token = '7g9nrreKnuWAVcyzJrE0b+CS69WxUaGtrw4jaGuvyCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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