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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de8aa9886eb09dfb68c81595a982ebe82c85463da39e4053efdfa2f51ea52db8' 
  AND token = 'lPl4USTZGCDF/m95/7E3dQ0pjzNLkyIZnsHb3dv59Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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