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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6b03c5b6e10a6654ae094cb4cfd7c384bbc6a3d11b6dc56a095211b19a145ba' 
  AND token = 'zrebww+I13ioB0eKohg98AZR+l1vJImctiP8mCEOs2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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