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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46864436cc01da6d568d043ebbcfb85f0d57fd8c83ca4c1fdf186876e9270fb7' 
  AND token = 'Vp0Ml8Ki+3bHo0dCbEOveDU7pF3+h87sBARllW9joPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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