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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b8b035c83d699d6f2126c6566ffa20da25dc9b390c5af0a13842a52201a8f08' 
  AND token = 'iMcbkxfq03yOBgp5NNLijoh26qx2b9I3xlmkhRDpIqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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