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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddfd26d0a750d3d45f710d734783681bd890b553d3d6100e3e1cb2583a990ac5' 
  AND token = 'eN3FbVC8V7bjCF52YsLhSrb8tE7uGPaWIf2HGO34i4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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