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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3019b58fde12133c2ddc1d8a2de9f3beba8e5f378152d1a3c2324cd1687096c8' 
  AND token = 'jim5/zXtNR/cW4CpW71i5luZOURkK37GHC89/U9KGHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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