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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06c3edb33069184c0dc29364fa3f99a7263f6bb3f9f2cf4b795fb554263cd98a' 
  AND token = 'W3iEOmCgW8icemhCE24wVG1bxZKewOdv0OWKcUD9848=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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