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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0168b2ddfb2da911d3ed4709c797471f3b3a74192b2cfd7a0d7f69e261111a7' 
  AND token = 'AOabrD6QKFWHzPuroLJGNYLe1N/crmLxFrXCrc0uQMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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