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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e721b11e951281670fd9913f3b48ff98627514a3dea5e12749dd05ba1ddb13f' 
  AND token = 'MhYON8g1s9IlIHi9AMR2rt8jZyMXJJqRoYcSHzg2b2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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