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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a91339f8e8a53c9ad2fdc5a6aaea2903d38d0f170b0f56f911aa55121a1092b' 
  AND token = 'oefdAN4Fjoi16U7eIqeGVkTv14EXogUTA8wdzF6oDSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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