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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc2529f586cfa9d478e1812c6f0e7a8140a80193fb5a7e3eec89fd2a42f0b1a7' 
  AND token = 'Ar/0ST+TZp3YOR3GsrWtkgEtrgdz91WwDwHpxPOb6Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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