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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ed48e59d959d21b95f0487f11d7bf249d082e21b6b2dce743001b20d7dd6b0b' 
  AND token = 'Br9hKJOLZERyx7QPmdGYKAkLGaheukmzAxE0Cg5YmkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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