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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e07291e8a4072199d9790ee17f7e6878bb4a9727df904d5232444995ef04302' 
  AND token = 'zkXIQ8Mj0WmC0ZmpD85T8feDdtB8sJ+i0taHPhm75rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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