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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3707b5443db053cd39b2e62afab5ad0f63103189941b8278664d2ed17180046' 
  AND token = 'GWPU3NWb8gPMJP4Mda/BfAuinU8MDDTW2fzAth2D+k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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