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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b87f0265cb14fd9d00d3cef111075a93b0e14b05335dae88441ed9e23a15b6bc' 
  AND token = 'a9mc7yo/IPjQJFOQYEhEBoH3h3Ao4pfwXAUNd89BGmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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