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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a3fdef2cf3bed1ada311dbd125a04974d3aeaa37a87fab486f158a4e1f26e5a' 
  AND token = '1QOC/3+QyHtByi5/G60ytJWeDXuUelEeVL7xJjSUGFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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