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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b042d6e44e3405a3e35547da19d9ce3739a1b61c804d1031fb430f43c7efde63' 
  AND token = '0AlBzcKNGo+yzoUyAIPQHeKmCmMz9mooV2yovZE06+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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