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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe592cde3f0fd6fc7b4375643c4476948b1c1d231c1ca2948e749ffa851db340' 
  AND token = 'lqmLWH/Y27kdEXdMhn8Kr0cDgOFc8KiT9XemNQ82seQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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